MainActivity。java
package com.example.internetimageview;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.text.TextUtils;import android.view.Menu;import android.view.View;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity {    private EditText etImageUrl;    private ImageView ivImage;    public static final int SHOWIMAGE=1;    private Handler handler=new Handler(){    public void handleMessage(android.os.Message msg) {    switch (msg.what) {case SHOWIMAGE:Bitmap bitmap=(Bitmap) msg.obj;ivImage.setImageBitmap(bitmap);break;default:break;}    };    };@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initViews();}private void initViews() {   etImageUrl=(EditText) findViewById(R.id.etImageUrl);   ivImage=(ImageView) findViewById(R.id.ivImage);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}public void viewImage(View view){final String imageUrl=etImageUrl.getText().toString();if(TextUtils.isEmpty(imageUrl)){Toast.makeText(getApplicationContext(),"图片路径不能为空",Toast.LENGTH_LONG).show();}else{new Thread(){public void run() {try {URL url=new URL(imageUrl);HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();    httpURLConnection.setRequestMethod("GET");    httpURLConnection.setConnectTimeout(5000);    int responseCode=httpURLConnection.getResponseCode();    if(responseCode==200){    InputStream inputStream=httpURLConnection.getInputStream();    Bitmap bitmap=BitmapFactory.decodeStream(inputStream);    Message message=new Message();    message.what=SHOWIMAGE;    message.obj=bitmap;    //ivImage.setImageBitmap(bitmap);    handler.sendMessage(message);    }else{    Looper.prepare();    Toast.makeText(MainActivity.this,"显示图片失败",Toast.LENGTH_LONG).show();    Looper.loop();    }} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}.start();}}}
activity_main.xml
            
   
   
   
   

 








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